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View Full Version : Is a 125cu steel worth it



VeniceDiver
12-12-2007, 16:12
I would like to 2 dive on one tank if possible with nitrox. would a 125 steel
work?

in_cavediver
12-12-2007, 17:15
I would like to 2 dive on one tank if possible with nitrox. would a 125 steel
work?

The simple answer is "it depends"

You can do a lot of gas management calculations (good stuff to know) but what you'll find is for most rec profiles, you'll have around 50-55cft each dive to work with. In an 80, th 500psi rule gives around 65 cft to use. Its basically like 2 63's in one tank.

Personally, I like to do a day or two on a single set of 104's. (4-5 dives).

Mycroft
12-12-2007, 18:56
Well, if a 125 works, then a 130 would be even better. Personally I love my 130 cft HP steels

Puffer Fish
12-12-2007, 19:57
Well, if a 125 works, then a 130 would be even better. Personally I love my 130 cft HP steels
Well, if a 130 is good, then a 133 is even better.

I think the issue here is - air consumption rate, and depth of dive.

I have larger tanks, but not so I can make two dives on a tank...but to make one longer dive with nitrox at 60 - 90 ft.

The one place this, at least for me, would be possible, is a shallow shore dive...diving a jetty, for example, would be, with a 133.... a single dive...(assuming I am taking pictures and have my "calm" breathing rate)...at 16 or so feet would be 188 minutes... yea, I might do that as two dives.

in_cavediver
12-12-2007, 20:21
Well, if a 125 works, then a 130 would be even better. Personally I love my 130 cft HP steels
Well, if a 130 is good, then a 133 is even better.

I think the issue here is - air consumption rate, and depth of dive.

I have larger tanks, but not so I can make two dives on a tank...but to make one longer dive with nitrox at 60 - 90 ft.

The one place this, at least for me, would be possible, is a shallow shore dive...diving a jetty, for example, would be, with a 133.... a single dive...(assuming I am taking pictures and have my "calm" breathing rate)...at 16 or so feet would be 188 minutes... yea, I might do that as two dives.

One thing that hasn't been addressed is trim and buoyancy characteristics. Big steel tanks can start getting heavy and throw your trim off. (or even be too negative in a thin wetsuit). In a single, its hard to hit that threshold but it can be done.

Be sure to look at that before making the decision.

Lastly, for big 'reasonable' gas, Faber has the FX 149 series tanks. Its basically a LP 121 or LP 131 at 3442. That tank would be plenty for a couple rec dives. A pair would look nice on my back.......

If you want 'unreasonable' gas, Heiser is your tank. They have heavy water heaters of gargantuan proportion, up to a 190 that weighs 90lbs.

cummings66
12-12-2007, 21:06
I can with my Steel HP120's get two dives per tank with most of my buddies, but some of my buddies using AL80's can almost last as long as I do with the Hp120. So, whether you can do one or two dives would depend on your buddy as much as your dive profile.